7 Machines for mine and tunnel construction, namely boring machines, drilling cars, drill hammers, loading machines, vertical and lateral tilting loaders, hoist and manipulating equipment, namely extension lifts, roof supports, power jacks and jack stands, shoring machines, drilling machines, rock drills, drill mounts, cutter arms, drilling carriages, conveyor machines for mines, conveyor reels, regenerative brakes for machines, braking power generators, conveyor machines, belt conveyors and parts therefor and controls therefor